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The Specimen

Stenacron interpunctatum (Light Cahill) Mayfly DunStenacron interpunctatum (Light Cahill) Mayfly Dun View 6 PicturesThis is a fairly small late-season female Stenacron dun.
Collected August 22, 2006 from the West Branch of Owego Creek in New York
Added to Troutnut.com by on August 23, 2006

The Discussion

TaxonAugust 24th, 2006, 12:24 am
Site Editor
Plano, TX

Posts: 1301
Looks to be Stenacron interpunctatum (Stenonema heterotarsale).
Roger Rohrbeck
www.FlyfishingEntomology.com
TroutnutAugust 24th, 2006, 8:29 am
Administrator
Bellevue, WA

Posts: 2553
Thanks. I guess that's sort of the default guess.

Do you know any reference to rule out the other species of Stenacron? I'll have to check my papers more carefully but I don't think I've found a good one yet. You're probably right just based on distribution and abundance, but I've collected such a wide range of Stenacron specimens (all listed under interpunctatum on this site) that it's hard to believe they're all the same species.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
TaxonAugust 24th, 2006, 12:26 pm
Site Editor
Plano, TX

Posts: 1301
Jason-

My guess is based on the striking similarity of your photo to the photo labeled "Stenonema heterotarsale, female dun" on Color Plate XI in Hatches II. The wing coloring, venation, and marking are about as close as I've ever seen.
Roger Rohrbeck
www.FlyfishingEntomology.com
WiflyfisherAugust 24th, 2006, 6:34 pm
Wisconsin

Posts: 612
My guess is based on the striking similarity of your photo to the photo labeled "Stenonema heterotarsale, female dun" on Color Plate XI in Hatches II. The wing coloring, venation, and marking are about as close as I've ever seen.


In the past I have caught those same mayflies on the *********** River in NW WI. and came to the same conclusion using photos in Hatches.
John S.
https://WiFlyFisher.com
TroutnutAugust 24th, 2006, 7:36 pm
Administrator
Bellevue, WA

Posts: 2553
My main concern with the identification is that the differences between different Stenacron species may only be discernible in the male spinner forceps or nymph mouth parts or something. I'll try to find a better reference to the genus and figure iout.
Jason Neuswanger, Ph.D.
Troutnut and salmonid ecologist
TaxonAugust 24th, 2006, 8:45 pm
Site Editor
Plano, TX

Posts: 1301
Jason-

Good point. Let me know what you find.
Roger Rohrbeck
www.FlyfishingEntomology.com

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